PROCESS AND APPARATUS FOR RECOVERING OLIGOMERATE

摘要

A process and apparatus uses a flash drum to separate light hydrocarbons from heavy oligomerate from an oligomerization zone. The heavy oligomerate can bypass a fractionation column in the oligomerate recovery section and be recycled to the oligomerization zone or other zones. Costs are saved by avoiding repeatedly transporting and processing the heavier recycled oligomerate.

主权项

1. An apparatus for making oligomers comprising:
an oligomerization zone for oligomerizing olefins in an oligomerization feed stream to produce an oligomerate stream including hydrocarbons; a flash drum for separating said oligomerate stream in communication with said oligomerization zone; a light flash line from the flash drum and a heavy flash line from the flash drum with an inlet to the light flash line above an inlet to the heavy flash line, wherein the heavy flash line is configured and arranged to receive the heaviest hydrocarbons from said oligomerate stream; a fractionation column in communication with said light flash line for fractionating said light flash oligomerate stream; and said oligomerization zone in downstream communication with said heavy flash line, and wherein said heavy flash line bypasses said fractionation column.